conan-center-index: [package] boost/1.74.0: broken package_info when i18n_backend=icu

Everything builds just fine, but then the components fail validation:

$ conan install boost/1.74.0@ -o boost:i18n_backend=icu --build boost
...
ERROR:
        ConanException: boost/1.74.0 package_info(): Package require 'libiconv' declared in components requires but not defined as a recipe requirement